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CATEGORIES OF TEMPERATURE MEASUREMENT DEVICES
Filled Systems For Temperature measurement
Filled systems are so named because they use the thermal expansion of a fill fluid to provide temperature sensing and measurement. Filled thermal systems can provide local or remote temperature indication.
A filled system consists of a bulb immersed in the measuring fluid, a long capillary or fine bore tube, a measuring unit that may be a Bourdon tube or bellows, and a filling fluid which may be liquid or gas. Figure shows an example filled system. The whole system is gas tight and filled completely with an appropriate liquid or gas.
Figure Filled system
Filled Thermal system For Temperature measurement
The purpose of a filled thermal system is to provide a remote temperature indication and/or temperature recording. The filled thermal system is similar to a pressure gauge; instead of the sensing tube responding to changes in pressure, it responds to temperature changes. The filled thermal system (Figure) consists of a temperature sensor bulb connected by a capillary tube to a readout instrument.
Figure Filled Thermal System
Temperature Switch For Temperature measurement
Temperature switches provide high or low temperature detection, backup existing alarms, actuate additional equipment for a safety interlock system. Some temperature switches (Figure) consist of a bulb, capillary tubing, and electrical switch elements. The temperature switch’s bulb and capillary design is classified into one of the filled systems. Other temperature switches can use bimetallic elements as the temperature element.
Figure Filled System Temperature Switch
Bimetallic Thermometer For Temperature measurement
A bimetallic thermometer (figure 10) is so named because the temperature-sensing element consists of two different metals that have different coefficients of expansion.